Surface better error instead of MOVED errors during network disconnects in redis clusters

StackExchange.Redis/StackExchange/Redis/ResultProcessor.cs

@@ -140,7 +140,8 @@ public virtual bool SetResult(PhysicalConnection connection, Message message, Ra
                 var bridge = connection.Bridge;
                 var server = bridge.ServerEndPoint;
                 bool log = !message.IsInternalCall;
-                bool isMoved = result.AssertStarts(MOVED);
+                bool isMoved = result.AssertStarts(MOVED);
+                string err = string.Empty;
                 if (isMoved || result.AssertStarts(ASK))
                 {
                     message.SetResponseReceived();
@@ -151,21 +152,29 @@ public virtual bool SetResult(PhysicalConnection connection, Message message, Ra
                     EndPoint endpoint;
                     if (Format.TryParseInt32(parts[1], out hashSlot) &&
                         (endpoint = Format.TryParseEndPoint(parts[2])) != null)
-                    {
+                    {
                         
                         // no point sending back to same server, and no point sending to a dead server
                         if (!Equals(server.EndPoint, endpoint))
-                        {
-                            if (bridge.Multiplexer.TryResend(hashSlot, message, endpoint, isMoved))
-                            {
-                                connection.Multiplexer.Trace(message.Command + " re-issued to " + endpoint, isMoved ? "MOVED" : "ASK");
-                                return false;
+                        {
+                            if (bridge.Multiplexer.TryResend(hashSlot, message, endpoint, isMoved))
+                            {
+                                connection.Multiplexer.Trace(message.Command + " re-issued to " + endpoint, isMoved ? "MOVED" : "ASK");
+                                return false;
+                            }
+                            else
+                            {
+                                err = string.Format("Endpoint {0} serving hashslot {1} is not reachable at this point of time. Please check connectTimeout value. If it is low, try increasing it to give the ConnectionMultiplexer a chance to recover from the network disconnect.", endpoint, hashSlot);
                             }
                         }
                     }
+                }
+
+                if (string.IsNullOrWhiteSpace(err))
+                {
+                    err = result.GetString();
                 }
-
-                string err = result.GetString();
+                
                 if (log)
                 {
                     bridge.Multiplexer.OnErrorMessage(server.EndPoint, err);